Mailing List flyrotary@lancaironline.net Message #41392
From: Greg Ward <gregw@onestopdesign.biz>
Subject: Re: [FlyRotary] Re: Rotor Identification / 20B NA
Date: Tue, 5 Feb 2008 08:50:18 -0800
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
That's a fact.  The guy who sold me my 20B, says the racers that are using them in the LA area are getting close to 700-800 HP at 9000+ RPM, and they live.  He tells me that the way I am configuring this thing, it won't be reaching anywhere near it's critical, and will be loafing along, at 6000 RPM!!  God I love these rotaries.
Greg Ward
----- Original Message -----
Sent: Tuesday, February 05, 2008 7:43 AM
Subject: [FlyRotary] Re: Rotor Identification / 20B NA

Another thing to remember is that very few 20Bs were N/A in standard automotive use. The 20B will produce nearly 300 HP normally aspirated at less than 7000 RPM. Al Gietzen dynoed the 20B he put in his cozy and with a fairly restrictive exhaust it made 285 at 68 or 6900 RPM. With a 2.85:1 redrive and any slight flow improvement it would best 300. Another real plus is that the engine is not at all highly stressed at that output.
Bill Jepson 


-----Original Message-----
From: cbeazley <cbeazley@innovista.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tue, 5 Feb 2008 12:00 am
Subject: [FlyRotary] Rotor Identification / 20B NA

Hi Bob; 
 
Meant to mention a few more HP options - mild street port and extended street port are also good options if the engine is already apart. 
Here are a few web sites with pics of various port types - don't believe everything that is written - particularly idle RPMs. 
  http://www.turborx7.com/portingpictures.htm 
  http://www.mazdarotary.net/porting.htm 
 
Cheers 
Cary 
 
 
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